Severoonezhsk (Russian: Северооне́жск) is an urban locality (an urban-type settlement) in Plesetsky District of Arkhangelsk Oblast, Russia, located 55 kilometers (34 mi) west of the town of Mirny, on the left bank of the Onega River.

The first house in Severoonezhsk was built in February 1973 shortly after huge deposits of bauxite were discovered.

It was planned that the plant would be served by a city with the population of approximately 100,000, with the name of Severorossiysk, located on both banks of the Onega.

There is a road connecting Severoonezhsk to Oksovsky and further on to the highway which is a historic trading route between Kargopol with Arkhangelsk.

The weekly newspaper of Plesetsky District, Kuryer Prionezhya (Russian: Курьер Прионежья), has been published since 1999.